If what you are talking about is strictly above ground and you are simply worried about the appearance then build a simple form around the exposed area and pour a cap. You can drill the existing concrete and insert rebar pegs to help the cap adhere to the existing concrete.
If there is a...
RisaTower covers both Schifflerized angles and 60° bent plate in their database. Dan Horn did a very good job of detailing almost every type of tower member and configuration.
Radian used to have a Schifflerizing bender and when they moved their manufacturing to the U.S. then sold it off I believe their equipment was at the Rohn factory in Peoria, IL. You can contact Dave Brinker their VP of Engineering at 309-633-6888.